Thai royal families, namely Bangkok dynasty and Chakri dynasty, are Thai royal families that have continued from 1782 to this day. The monarch of Bangkok dynasty was the ruler who had absolute power before 1932. 1932, Thailand became a constitutional monarchy. Since then, the king has only been a symbolic head of state.

Rama I, the founder of Bangkok dynasty, was once made a prince by Zheng Xin the Great who annexed Wu Li dynasty, so all members of the royal family of Bangkok dynasty took Zheng as China's surname, such as Rama I, and Lotra Naboulet, the Buddha, named Zheng Buddha. 1786, Rama I claimed to be Hua Zheng, the son of Zheng Xin, and sent envoys to pay tribute to the Qing Dynasty. Qianlong made him king of Siam. Since then, Rama I, II, III and IV have paid tribute to the Qing court many times.